package com.sky.service.impl;

import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    private static final String WX_LOGIN_URL = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;

    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public User wxLogin(UserLoginDTO userLoginDTO) {
        // 调用微信接口服务，获得当前微信用户的openid
        String openid = getOpenId(userLoginDTO.getCode());

        //判断openid是否为空，如果为空表示登录失败，抛出业务异常
        if(openid.isEmpty()){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        // 根据openid查询数据库，判断当前用户是否为新用户
        User user = userMapper.selectByOpenid(openid);

        //如果是新用户，自动完成注册
        if (user == null) {
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }

        //返回这个用户对象
        return user;
    }

    public String getOpenId(String code){
        Map<String,String> paramMap = new HashMap<>();
        paramMap.put("appid",weChatProperties.getAppid());
        paramMap.put("secret",weChatProperties.getSecret());
        paramMap.put("js_code",code);
        paramMap.put("grant_type","authorization_code");
        return HttpClientUtil.doGet(WX_LOGIN_URL, paramMap);
    }
}
